MindMap Gallery Magnetic particle testing
A mind map of magnetic particle testing, such as its specific steps: pretreatment, magnetization, application of magnetic powder, magnetic mark observation, evaluation and recording, demagnetization, and post-processing. Let’s take a look at more knowledge about it.
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This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
Magnetic particle testing
Purpose
Detect defects
surface
near surface
principle
magnetic field
One of the basic properties of material existence
space
Magnetism
Existence area
in and around
magnetized objects
energized conductor
magnetic force
Product of magnetic field strength
Proportional
Distance between magnetic poles
Inversely proportional
Magnetic media
additional magnetic field
Same direction as the magnetic field
Paramagnetic substances
Opposite to the direction of the magnetic field
diamagnetic matter
Close to the original magnetic field
Non-magnetic
magnetization
ferromagnetic materials
Magnetization curve
Magnetic permeability curve
µ
μm
ikB
Hysteresis loop
Repeated magnetization in an alternating magnetic field
Br
hc
Hm
Leakage magnetic field
Magnetization method
Perpendicular magnetization
Good effect
parallel magnetization
poor effect
Magnetization with included angle
The angle is generally greater than 45°
Demagnetization method
Heat treatment demagnetization method
Heated to above Curie temperature
paramagnetic
Reversal magnetic field demagnetization method
The reverse process of magnetization technology
The direction of the magnetic field constantly changes forward and reverse
Magnetic field strength from large to small (enough to overcome coercive force)
typical application
Tube and shaft workpiece inspection
Gear shaft workpiece inspection
Disc workpiece detection
Detection of workpieces with coating on the surface
Result judgment
shape
size
"GB/T 15822 Magnetic Particle Flaw Detection Method"
crack-like magnetic marks
independent dispersed magnetic traces
Linear defect magnetic marks
Round defect magnetic marks
Continuous defect magnetic marks
Dispersed defect magnetic marks
step
preprocessing
Clean debris from workpiece surface
Remove non-conductive layers and burrs from energized parts
Disassemble a combined assembly
Block holes and holes that do not need to be inspected. Do not block them during inspection.
Dry inspection keeps the workpiece surface dry
There should be no moisture on the surface of the workpiece using oil magnetic suspension.
The surface of the workpiece using water magnetic suspension should be degreased
magnetization
circumferential magnetization
Longitudinal magnetization
multidirectional magnetization
Apply magnetic powder
Magnetic Mark Observation, Assessment and Recording
demagnetization
Post-processing
method
Wet and dry methods
wet method
Magnetic suspension distribution on workpiece surface
Dry method
Dry magnetic powder is applied directly to the workpiece surface
Continuous method and residual magnetization method
continuous method
Apply external magnetic field to magnetize and apply magnetic powder and magnetic suspension at the same time
Residual magnetism method
Magnetize first and then add magnetic suspension
Materials Instruments
Magnetic powder and magnetic suspension
Magnetic powder
Powdered ferromagnetic material
Classification
Fluorescent magnetic powder
Special magnetic powder
Non-fluorescent magnetic powder
performance
magnetic
granularity
shape
fluidity
density
resolution
magnetic suspension
Wet flaw detection
Classification
oil magnetic suspension
water magnetic suspension
Fluorescent magnetic suspension
carrier liquid
Liquid used to suspend magnetic powder
water-based carrier fluid
Oil-based carrier fluid
Anhydrous ethanol carrier solution
Instructions
Spray method
brushing method
Soaking method
Magnetic particle flaw detector
Magnetized power supply unit
The core part of the magnetization flaw detector
Low voltage and high current generating device
magnetizing coil
Cross coil
Single pulse magnetizing circuit device
Power outage phase controller
Quick power off experimenter
Workpiece holding device
Indicating and control devices
lighting fixtures
Demagnetization device
AC coil demagnetization device
DC commutation attenuation and demagnetization device
AC voltage reduction attenuation demagnetization device
test block
Artificial defect standard test piece
Type A
A1
A2
A3
Type C
D type
Artificial defect test block
magnetic field indicator
Type B standard defect test block
Natural defect test blocks and special test blocks